Improvement in elevators



` V. C. BLMR.

Improvement in Elevators.

Patented June 6,1871.

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UNITED vALnNTINn o.. BLAIR, or wnnArLANn, PENNSYLVANIA.

IMPROVEMENT IN ELEVATORS.

To all whom'it may concern:

Beit known that I, VALENTnvE C. BLAIR, of Wheatland, in the county ofMercer and State of Pennsylvania, have invented a new and usefulImprovemerdl in Elevators; and I do hereby declare that the following isa full, clear, and exact description thereof, which will enable othersskilled in the art to make and use the same, reference being had to theaccompanying'drawing forming part of this specification, in which-Figure l is a side view of my improved elevator, parts being broken awayto show the construction. Fig. 2 is a detail sectional view of the sametaken through the line a' m, and

Similar letters of reference indicate corresponding parts.

My invention has for its object to furnish an improved safety attachmentfor elevators, designed more particularly for the elevators in mineshafts, but equally applicable to elevators in storehouses and otherplaces, and which shall be so constructed as to stop and hold the cageor platform should the hoister rope 0r chain accidentally break; and itconsists in` the construction and combination of various parts ,of theapparatus, as hereinafter. more fully described.

A is the frame-work of the cage or platform,

which is provided with guides al a? to keep it in place upon the slidesB, upon which it moves up and down. C are levers, which are pivoted tothe frame-work of the cage A, one upon each side of each of the slidesB, and upon the inner ends of which are formed jaws to clamp the saidslides B and hold the said cage suspended. The outer ends of the leversC are bent inward, and are pivoted to the lower ends of the rods or barsD, which pass up through holes in the corners of the upper part of theamawork of the cage A, said holes being made larger than the said barsso that the bars may work freely. The upper ends of the four bars D arepivoted to the ends of the four arms of the bow E, through the center ofwhich the hoisting rope or chain F passes. G are springs which areattached to the frame A of the cage, and which are connected with theouter ends of the levers C by stirrups, links, orkeepers g', and whichare so arranged and made of such strength that when the strain upon thebow E is released by the breaking of the hoisting-rope or chain F theywill force down the outer ends of the levers G and cause their innerends to clamp the slides B, the weight of the cage causing the saidcatch-levers to clamp the said slides more firmly. The lower end of thehoisting rope or chain F is attached to the center of the centralcross-bar at the top of the frame A, and is provided with a stop, f', soarranged that when the strain is applied to said hoisting-rope the firsteect will be to raise the bow E suiiiciently to withdraw the levers Cfrom the slides B. The strain will then come upon the frameA of thecage. The

levers G will thus be held away from the from such accidents.

Having thus .described my invention, I claim as new and desire to secureby Letters Patent-,-

1. Thelever clamps or catches G, placed one upon each side of each ofthe slides B, and each provided with a spring, G, or equivalent spring,in combination with the frame work A and slides B of an elevator orhoist ing apparatus, substantially as herein shown anddescribed, and forthe purpose set forth.

2. The combination of the lever clamps or catches C, springs G, pivotedbars D, fourarmed bow E, and stopf with each other and with theframework A of the cage or platform, and slides B, substantially asherein shown and described, and for the purpose set forth.

VALENTINE C. BLAIR.

Witnesses DAVID Rrsnn, STEPHEN H. VANNEss.

ATENT IFICE..

